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Railcar Leasing and Management Services Group - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2018
Minimum    
Segment Reporting Information [Line Items]    
Lessee, Operating Lease, Term of Contract 1 year  
Maximum    
Segment Reporting Information [Line Items]    
Lessee, Operating Lease, Term of Contract 16 years  
Railcar Leasing and Management Services Group [Member] | Minimum    
Segment Reporting Information [Line Items]    
Lessor, Operating Lease, Term of Contract 1 year  
Railcar Leasing and Management Services Group [Member] | Maximum    
Segment Reporting Information [Line Items]    
Lessor, Operating Lease, Term of Contract 10 years 20 years
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group [Member]    
Segment Reporting Information [Line Items]    
Net book value of unpledged equipment $ 1,557.8  
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Secured Debt [Member]    
Segment Reporting Information [Line Items]    
Debt Instrument, Collateral Amount 3,987.4  
TRIP Holdings | Railcar Leasing and Management Services Group [Member] | Secured Debt [Member] | TRIP Master Funding Secured Railcar Equipment Notes [Member]    
Segment Reporting Information [Line Items]    
Debt Instrument, Collateral Amount 1,166.0  
TRL 2012 | Railcar Leasing and Management Services Group [Member] | Secured Debt [Member] | TRL 2012 Secured Railcar Equipment Notes - RIV 2013 [Member]    
Segment Reporting Information [Line Items]    
Debt Instrument, Collateral Amount 482.2  
Property Lease Guarantee [Member] | Railcar Leasing and Management Services Group [Member]    
Segment Reporting Information [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 2.4